Transcript Chester Engineers Activities in the Latin American Market

Refinery Water Balance
Refinery Water Balance
Thumbnail Sketch of Return On Investment for
Sour Water Capture
– Where Applicable: Any Distillation Column Overhead Water
Accumulator.
– Estimated Equipment Capital Investment: ~ $800 K.
– Return on Investment via Realized Reductions in O&M costs:
~ 18 Months.
– Ongoing O&M Cost: < $0.10 per 1000 gallons.
Refinery Water
Engineering
& Associates
Benefits of Capturing Sour Water For High
Quality Process Supply Water
– Removes considerable contaminant loads to wastewater plant, thus
reducing central wastewater plant O&M costs.
– Provides steam condensate quality boiler feedwater.
– Resulting supply water does not need pretreatment for boiler feedwater,
such as Ion Exchange or Reverse Osmosis, thus reducing pretreatment
costs.
– Recovers considerable lost heat in wastewater and reuses to preheat boiler
feedwater, thus saving considerable money in lost BTUs and fuel costs.
– Greatly reduces Boiler Water chemical and blowdown costs by increasing
permissable Cycles of Concentration.
Refinery Water
Engineering
& Associates
Integrating The Solutions
Water Reuse Value Calculator - HPI/CPI Tertiary Waste Treatment
Input Required
Assumed/Calculated Data
Output
Customer Name
Customer Location
Plant Economic Data
Raw Water Costs
Makeup Demin Water Cost =
Sewer/Discharge Charge =
Fuel Cost =
Fuel Cost =
0.57
1.86
3.75
9
8
$/1000 gal
$/1000 gal
$/1000 gal
$/mcf (10 therms) if fuel is natural gas
$/MMBtu if fuel is something other than natural gas
Plant Operating Calculations (Current)
Wastewater Discharge
1000.0 gpm
Makeup Water Flowrate
2000.0 gpm
Calculated Savings
Makeup Water
Wastewater Discharge
Demin Water Treatment
Total Calculated Savings
1.4 MGD
2.9 MGD
1720.0 gpm
720.0 gpm
720.0 gpm
866880 kgal/yr
362880 kgal/yr
362880 kgal/yr
Additional Savings
Additional Fines/Levies
RO Concentrate Used as Raw Water Makeup =
Total Additional Savings
Savings Summary
Water Reuse (Demin Water)
Wastewater Discharge Minimization
Makeup Water
Additional Savings
Total Savings
Plant Operating Calculations (Desired)
Wastewater Discharge
280.0
Makeup Water Flowrate
280.0
Demin Water Produced
720.0
RO Concentrate (as Makeup)
180.0
494122
1360800
674957
2529878
$/yr
51710.4 $/yr
51,710 $/yr
0.67
1.36
0.49
0.05
2.58
$MM/yr
$MM/yr
$MM/yr
$MM/yr
$MM/yr
Effluent Operating Data
Average Minimum
Total Suspended Solids (TSS)
Turbidity (NTU)
Chemical Oxygen Demand
Total Dissolved Solids (TDS)
Conductivity
$/yr
$/yr
$/yr
$/yr
gpm
gpm
gpm
gpm
0.4
0.4
1.0
0.3
MGD
MGD
MGD
MGD
Get The Basic Costs
Water & Energy Value Calculator
Flow (GPM)
Heat Cost ($/MBTU)
Electricity Cost ($/KWH)
Water Cost ($/1000 Gal)
Discharge Cost ($/1000 Gal), (Treatment, Hauling,
Sewer)
Ambient Temperature ©
Condensate Temperature ©
100
5
0.07
2
2
20
71
Savings
Heating Savings
Water Make-up Savings
Water Discharge Savings
Year 1
$
$
$
Year 2
Year 3
198,226 $ 198,226 $ 198,226
103,680 $ 103,680 $ 103,680
105,120 $ 105,120 $ 105,120
Total Savings per year
$
407,026 $ 407,026 $ 407,026
GEW&PT Service and Chemical
Cost
Summary
Impact of feedwater quality on
boiler operational efficiency
BTU Value of Blowdown Heat
BD Heat Lost, $/ yr
Cycles
% BD
10
20
50
10%
5%
2%
Basis
Steam
Pressure
FW
klb/hr
111,111
105,263
102,041
100,000 lb/hr
600 psi
BD
klb/hr
11,111
5,263
2,041
With No Heat
Recovery
With Flash Tank
Bottoms
With Flash
Tank and
Heat Exch
$367,531
$174,093
$67,506
$147,947
$70,080
$27,174
$11,836
$5,606
$2,174
50 cycles
versus 10
cycles saves
$300,000/yr
50 cycles
versus 10
cycles saves
$120,000/yr
50 cycles
versus 10
cycles saves
$10,000/yr
CVR: Condensate Recovery
Potential Saving: $ 1,263,132
Project: Cost of Steam Leaks
Can we find 10 leaks?
$2MM Savings
Deployment of biokinetic modeling tools to optimize real time
biological wastewater process control in the oil refining industry
By Dave Kujawski; Arthur Wong
Courtesy of Refinery Water Engineering & Associates (RWE)
Jan. 15, 2010
Environmental Expert Magazine Article
•
http://www.environmentalexpert.com/resultEachArticle.aspx?cid=37921&codi=78871&level=0
Processing Magazine Article
• http://www.waterwasteproc-digital.com/wwprocessing/201002#pg6
Full Version Article w/Data
• http://refinerywater.zoomshare.com/2.html
Refinery Water
Engineering
& Associates